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Wearable Slide Rule Bangle Bracelet 


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Wearable Slide Rule Bangle 


Written By: caitlinsdad 


printer to print PDF file (1) 

several sheets of cardstock. thin cardboard (1) 

straight paper trimmer (1) 

glue, white (1) 


Slide rules are simple devices that can do some very complex mathematical calculations. 
They put into use some of the theory you learned about logarithms in high-school algebra. 

The Slide Rule Museum has a template to make a model slide rule. I took that and 
transformed it into a piece of functional jewelry. 

This will be made entirely from paper/cardstock. Advanced crafters can apply the same 
concept to wood and wood veneers, machined metals, or formed plastics. 

Note that accuracy of the instrument is limited to the medium, construction method, and skill 
of the operator. 

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Wearable Slide Rule Bangle Bracelet 

Step 1 — Wearable Slide Rule Bangle Bracelet 

• This project illustrates creating a large bangle. The prototype just turned out that size. You 
can scale the PDF of the slide rule graphic to be smaller if you want a thinner bangle or 
sized for a man's bracelet. 

• Download the PDF to make a papercraft slide rule from the Slide Rule Museum site . 

• Look for the "Scales to make a Mannheim Slide Rule - K,A,B,I_,C,D . Kinsman" and click 
on the image to access the PDF in your browser. 

• Print out on regular letter size paper. The graphic will also be our guide to construct the 

© Make Projects 

Page 2 of 9 

Wearable Slide Rule Bangle Bracelet 

Step 2 

• Make a bangle big enough for your hand to pass through and small enough so it does not 
fall off. 

• You need a round form to create the cardboard tube that is the basis for the bangle. 

• I am using a large peanut butter jar, 4 inches in diameter, as my form. Soup cans were 
way too small and I couldn't find any PVC pipe that was ideally about 3 1/2 inches outside 

• You could take a soup can and start wrapping newspaper around it to get the right 
diameter needed. 

• Start the prepwork for the project. Cut the cardstock into strips that are the height of the 
papercraft slide rule. 

• I used several colors of cardstock. When laminated, it will give a multi-colored layer look 
at the edges. 

© Make Projects 

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Wearable Slide Rule Bangle Bracelet 

Step 3 

• Wrap the jar in plastic wrap. This keeps it clean from the glue. I wrapped it several times 
to even out the surface so that the cardboard tube could slide off of the jar past the ridge it 
had at the bottom of the jar. 

• Glue two strips by overlapping on the end about an inch. A single strip did not wrap entirely 
around the jar and this helps to glue the strips in place. 

• Glue a layer of cardstock around the jar. Don't snug it up too tight but keep it close enough 
to conform to the jar. 

• Continue gluing on the cardstock strips but butting the end to the last edge glued down. 
This will prevent bumps in the cardboard tube. Coat the entire strip with glue to laminate it 
to the previous strip. Smooth over to get rid of air and glue pockets. 

• When you have two or three layers, slide off to test that you can get it off the jar. 

• Position back on the jar and continue adding layers of cardstock. I think I had about a 9 
layer lamination. You get a feel for how thick your lamination should be if it is fairly stiff 
when it is removed from the jar. It will become stiffer as the glue dries. 

• When the tube is still wet, you can work the edges with something like a marker barrel or 
tool to burnish the edge so it has a smoother finish. 

© Make Projects 

Page 4 of 9 

Wearable Slide Rule Bangle Bracelet 

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• While the main tube is drying, you can start cutting out the bottom portion of the slide rule 

• Use that to size the strips that will form the bottom rim of the slide rule bangle. 

• From now on, the construction needs to be fairly neat so that you line up all the edges of 
your strips when glued down. It will increase the accuracy of your final product. 

• Build up the bottom rim till it is about double the thickness of the main tube. 

© Make Projects 

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Wearable Slide Rule Bangle Bracelet 

Step 5 

• From the template cut out cardstock strips sized to match the slide rule middle slider part. 

• This time, we need to make a ring that will be free from the main tube so it can rotate. With 
the lamination strip, glue only at the point where it makes a ring onto itself and allows it to 
move freely. 

• Continue to laminate cardstock strips until it reaches the thickness of the base rim. 

© Make Projects 

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Wearable Slide Rule Bangle Bracelet 

Step 6 

• From the template, cut cardstock strips the size of the top portion of the slide rule model. 

• Glue on to the main tube to form the top rim of the bangle. This is also the locking ring for 
the middle slider ring. 

• I used a painter's tool to burnish the joint and edges where the middle ring slides. This is to 
make the middle ring turn more smoothly. 

• Apply the middle slider graphic to the middle ring. 

• I had some space on the ring where the graphic did not cover. I put on a thumbtab to help 
with sliding the ring. It is just several layers of cardstock folded over and glued. 

© Make Projects 

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Wearable Slide Rule Bangle Bracelet 

Step 7 

• Apply the graphic for the bottom portion of the slide rule. 

• Line up the middle slider ring. 

• Apply the graphic for the top portion of the slide rule. 

• Cut out a piece of plastic from some scrap packaging that will be the clear marker slider. 

• Use a screw tip or awl to scratch a straight line into the plastic. 

• Mark it with a marker. Wipe away the excess ink so that the scratched line is highlighted. 

• Fold over the bangle and tape to secure ends on the back. The indicator marker should be 
able to slide on the bangle. 

Step 8 


\ I ^^ 



• Stuck at a boring party and need to 
calculate your escape trajectory? 
Use your handy slide rule bangle 

• You can always be fashion-forward 
with this slide rule bangle. 

• Go and make the more advanced 
slide rules with other scales. 

• Use this technique to make a 
cryptex bangle bracelet. Wear an 

© Make Projects 

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Wearable Slide Rule Bangle Bracelet 

This project can be adapted to make a wood, metal, plastic or ceramic bangle/bracelet. Since 
the scale markings are intricate, it may require a laser cutter or other method to print directly on 
the material used. 

This document was last generated on 201 2-1 1 -03 01 :45:08 AM. 

© Make Projects Page 9 of 9